Abstract：Abstract ： Research purposes ： In view of the existing concrete simply - supported double T railway bridge in the increasing speed of train and axle load of freight train leading to the problems of large bridge transverse amplitude，a retrofit measure with adding steel braces between web plates for the railway bridge is proposed in this paper. This retrofit method is simple in construction，and can shorten the construction period. It also doesn’t interrupt the normal operation of the train， and has little effect on the vertical performance and substructure of the bridge. The static performance of the bridge and dynamic interaction between train and bridge are studied through the finite element analysis software ANSYS and multi - body dynamics software Universal Mechanism (UM). Research conclusions:(1) Different types and layouts of braces have large effect on increasing the transverse stiffness of the bridge. The transverse stiffness of beam body increases more effective when strengthening the tie - beam and lower part of the beam body connection. (2) The braces near the mid - span of the bridge have little effect on increasing the transverse stiffness of the bridge. ( 3 ) This retrofit method can effectively increase the transverse stiffness of the bridge， but does not influence the vertical stiffness of the bridge because of adding too much weight of the bridge. So it has little effect on the vertical performance and substructure of the bridge. (4) Track irregularity spectrum is the main source of the vehicle - bridge coupled system, it is necessary to choose reasonable track irregularity spectrum in the vehicle - bridge coupled simulation analysis. (5) After retrofit the bridge can satisfy the operational requirement with increase of the train speed and axle load. (6 ) This retrofit method can be used for the existing concrete simply - supported railway bridge when the transverse amplitude is transfinite, construction schedule is very tense and it can effectively reduce disturbance for the lower structure of the bridge.
2016, Vol. 33 
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